# File erubis/converter.rb, line 176
    def add_expr(src, code, indicator)
      case indicator
      when '='
        @escape ? add_expr_escaped(src, code) : add_expr_literal(src, code)
      when '=='
        @escape ? add_expr_literal(src, code) : add_expr_escaped(src, code)
      when '==='
        add_expr_debug(src, code)
      end
    end

# File erubis/converter.rb, line 127
    def convert_input(src, input)
      pat = @pattern
      regexp = pat.nil? || pat == '<% %>' ? DEFAULT_REGEXP : pattern_regexp(pat)
      pos = 0
      is_bol = true     # is beginning of line
      input.scan(regexp) do |indicator, code, tailch, rspace|
        match = Regexp.last_match()
        len  = match.begin(0) - pos
        text = input[pos, len]
        pos  = match.end(0)
        ch   = indicator ? indicator[0] : nil
        lspace = ch == ?= ? nil : detect_spaces_at_bol(text, is_bol)
        is_bol = rspace ? true : false
        add_text(src, text) if text && !text.empty?
        ## * when '<%= %>', do nothing
        ## * when '<% %>' or '<%# %>', delete spaces iff only spaces are around '<% %>'
        if ch == ?=              # <%= %>
          rspace = nil if tailch && !tailch.empty?
          add_text(src, lspace) if lspace
          add_expr(src, code, indicator)
          add_text(src, rspace) if rspace
        elsif ch == ?\#          # <%# %>
          n = code.count("\n") + (rspace ? 1 : 0)
          if @trim && lspace && rspace
            add_stmt(src, "\n" * n)
          else
            add_text(src, lspace) if lspace
            add_stmt(src, "\n" * n)
            add_text(src, rspace) if rspace
          end
        elsif ch == ?%           # <%% %>
          s = "#{lspace}#{@prefix||='<%'}#{code}#{tailch}#{@postfix||='%>'}#{rspace}"
          add_text(src, s)
        else                     # <% %>
          if @trim && lspace && rspace
            add_stmt(src, "#{lspace}#{code}#{rspace}")
          else
            add_text(src, lspace) if lspace
            add_stmt(src, code)
            add_text(src, rspace) if rspace
          end
        end
      end
      #rest = $' || input                        # ruby1.8
      rest = pos == 0 ? input : input[pos..-1]   # ruby1.9
      add_text(src, rest)
    end

# File erubis/converter.rb, line 103
    def init_converter(properties={})
      super(properties)
      @pattern = properties[:pattern]
      @trim    = properties[:trim] != false
    end

# File erubis/converter.rb, line 112
    def pattern_regexp(pattern)
      @prefix, @postfix = pattern.split()   # '<% %>' => '<%', '%>'
      #return /(.*?)(^[ \t]*)?#{@prefix}(=+|\#)?(.*?)-?#{@postfix}([ \t]*\r?\n)?/m
      #return /(^[ \t]*)?#{@prefix}(=+|\#)?(.*?)-?#{@postfix}([ \t]*\r?\n)?/m
      return /#{@prefix}(=+|-|\#|%)?(.*?)([-=])?#{@postfix}([ \t]*\r?\n)?/m
    end